Ah, some clarification of 'manual' required I think...
The one Guy has just bought is an automatic thermo-mechanical de-tensioner. The oil filled one is a hydraulic-mechanical de-tensioner...there are various 'manual' tensioners out there that are fit, adjust, readjust after a while. 'Zat' was a name used for a US sourced one, Lionel used to sell one, I've seen assorted DIY efforts.
The one Guy has bought is what I fitted to the last 12V motor I built and is regarded as a 'conversion' when used on the 164 motor. It's also the type commonly used on the 155 V6 as standard, although early ones did have the old 164-style hydraulic job.
Excuse the pedantry, but it helps if everyone is talking about the same things.....
I made my own conversion stud when I did mine. Often, the worst bit to solve is the locking stud - they often get chewed up, and sad to say, I simply couldn't get it out of the block so had to live with double-nutting it. Plugging the oil return is easy enough, just need to make sure you don't get any swarf in the oil gallery.
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